Hi Nats,
Welcome to The Gauge.
I'm not a expert on painting brass, but I painted my first NY Custom Brass Erie caboose about 8 months ago.
I stripped the clear finish off because it was very thick and had some runs in it.
I airbrushed with Floquil right after the stripper was cleaned off and it was dry. I used a hair dryer to help speed up the drying process. After the decals were applied, the caboose was sealed with dullcoat.
So far the paint is sticking without a problem.
Some people have suggested to use Scalecoat paint, then bake in a oven. Others said to sandblast the brass before painting. I'm sure others will post with their suggestions, but this is how I did it and it seems to work for me. Below is a pic of the caboose.
Marty